Category Archives: Knit Dyeing

Removal of softener spot from the Fabric is a washing process, which is done in the dyeing bath. Softener spot is a dyeing fault which is occurred during the application of softener to the fabric in dyeing bath or de-watering machine. When this type of fault is found in a dyed fabric then it needs to make free the dyed fabric from the softener spots.

Generally, acid wash is done for removing softener spot from the fabric. It is an off line quality assurance system. When this type of fabric faults found in the finishing section then it sends for acid wash in the dyeing section. By the following way, softener spot can be removed from the dyed fabrics.

Knit Dyeing is a critical procedure and it is required to match the shade of the dyed fabric with the buyer’s approved swatch. Sometimes, it is found that the dyed fabric shade does not match with the approved swatch then this fabric is required to re dyeing. This re dyeing process is called stripping. Most of the time, black shade or deep shade is produced by the stripping process. Topping is another re dyeing process but stripping and topping is use for different case.

Stripping sequence of knit cotton fabric: Reactive dyes dyeing process is done for cotton or cellulosic fiber. Here, I have given a stripping process for the cotton fabric.

Fabric received from the batching section

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Required amount of water was taken into the machine

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The fabric was loaded and run for 5-10 minutes in normal temperature

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Wetting agent, anticreasing agent were added at a time for 5 minutes

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Caustic was dosing at normal temperature for 5 minutes

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Run for 10 min.

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Temperature increase at 1100C and continue for 40 min.

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Cooling at 800C

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Hydrose inject for 5 min.

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Temperature increased at 1100C for 10 min.

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Run for 30 min.

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Cooling at 800C

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Sample check

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Rinsing for 15 min.

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Hot wash

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Cold Wash

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Unload the Fabric

Stripping is done on the dyed fabric for this reason this type of re-dyeing increases the cost of the dyeing process.

Topping is defined as the addition of color to the fabric after completing one dyeing process. Sometimes it is found that the dyed fabrics do not match with the standard or buyer approved swatch then it needs to re dyeing, this process is called topping. Tipping sequence is near similar as the full dyeing sequence.

Generally, topping is done for the cotton fabric which is dyed by the reactive dyes. Here, I have given a topping process sequence on the cotton fabric which is dyed by the reactive dyes.

After completing a dyeing process, shade of the dyed fabrics are checked by the quality control department. If the shade of the dyed goods does not match with the buyers approved swatch then they give decision for topping or stripping.

Topping is an additional process which add extra dyeing cost on the dyeing process. So, a textile engineer should be aware about the dyeing of the fabrics.